What's the best new beta browser feature you can't wait to ship by default?
Smart Address Bar (because Firefox 3's AwesomeBar is that awesome)
Private Browsing Mode
Tab-Specific Crashing
"Speed-Dial" Web Page Thumbnail View
Resizable Text Areas
Drag and Drop Tabs to and from Windows
Bookmark, History, Password Syncing
None of the above, these are all mediocre excuses to do what the other browser is doing and ship a new release.
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